calyptra
IPA: kʌɫˈɪptrʌ
noun
- (botany) In bryophytes, a thin, hood of tissue that forms from the archegonium and covers the developing sporophyte and is shed as it ripens.
- (botany) any cap-like covering of a flower or fruit, such as the operculum over the unopened buds of Eucalyptus flowers
- (botany) Any of various coverings at the tips of structures, in the terminology of various authors; for example rootcaps and the apical cells of trichomes.
- (entomology) In flies such as the housefly, Musca, in the taxonomic order Diptera, zoological section Schizophora, subsection Calyptrata, the calyptra is a membranous rearward extension of the forewing; it covers the haltere.
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Examples of "calyptra" in Sentences
- The capsule is capped with a calyptra.
- The calyptra usually falls off when the capsule is mature.
- The shape of the calyptra can be used for identification purposes.
- The calyptra is usually lost before the spores are released from the capsule.
- The calyptra is golden yellow to brownish and completely envelops the capsule.
- In the UK, plants commonly produce calyptra with relatively long curving lids.